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Rear Diff Additive

This is a discussion on Rear Diff Additive within the Drivetrain forums, part of the LSx Technical Help Section category; Had my rear end fluid changed about 3-4months ago and I have noticed that it is whining more than usual ...

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    Senior Member theorangeguy's Avatar
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    Rear Diff Additive

    Had my rear end fluid changed about 3-4months ago and I have noticed that it is whining more than usual "specifically at interstate speeds"...I know the GM Additive was not used and they put synthetic oil in the rear end. Do you guys recommend the GM Additive? I've read quite a few threads on this subject and seen some people say yes and some people say no.

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    Former Mopar Man 2002ssslp's Avatar
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    Yes. Get the GM additive and change you gear lube to conventional "Dino" oil. Our rears are weak enough, don't help it to an early grave.
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    Senior Member theorangeguy's Avatar
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    Quote Originally Posted by 2002ssslp View Post
    Yes. Get the GM additive and change you gear lube to conventional "Dino" oil. Our rears are weak enough, don't help it to an early grave.
    so switch to non-synthetic and add the additive?
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    I just used synthetic with the additive in it already and I haven't had any issues and it has been like that for a couple of years.
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    Even though the stock rear has a torsen type posi that utilizes gears rather than clutches GM recommends the use of the additive to combat what is described as a "rusty screw" type noise. I have also read that dino oil is recommended over synthetic, but I have never seen a good explanation for this.

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    Veteran 0rion's Avatar
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    you'll most likely get answers all over the place for this as everyone seems to have their own way of doing it. This is another example of where I try not to over think things and stick with factory recommendations. My strange rear specifically said not to use synthetic and to run additive. The lack of additive really shouldn't make your rear whine though....it would make it chatter. The synthetic could possibly be why your rear seems a little louder. Personally unless it's really loud I wouldn't worry about it too much but then again.....I wouldn't run synthetic in there and would have the additive.

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    Former Mopar Man 2002ssslp's Avatar
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    Quote Originally Posted by theorangeguy View Post
    so switch to non-synthetic and add the additive?
    YES

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    Smiles for 9.5 Years cammed goat's Avatar
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    The additive allows the differential disconnect going through turns without making any noise. The additive doesn't reduce noise. Only the gear oil reduces the noise and lubricates the carrier bearings.

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    Veteran 0rion's Avatar
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    the friction modifier can make noise ( or lack of it rather) but the noise will be a chatter through turns. It's due to the clutches not engaging and disengaging smoothly across the face of the clutch. The question really becomes does the modifier effect the weight of the gear oil? I'm sure it does but how much I don't know. A thicker oil will be quieter but rob more HP. I go back to my original statement though......if you're unsure stick with what the factory recommendations are.



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